<?php
$microtime=microtime();
function fib($number){
	if($number==1){
		return 1;
	}
	elseif ($number==2){
		return 1;
	}
	else{
		return fib($number-1) +fib($number-2);
	}
}
echo fib(20)."<br/>";
echo $microtime;
?>